Positive Therapy for Autonomic Function & Mood in ICD Patients

Inclusion Criteria: 1. Adult men and women (≥18 years of age) who have received an ICD for primary or secondary prevention of sudden cardiac death. All patients will have systolic left ventricular dysfunction due to coronary disease or nonischemic cardiomyopathy. There is no requirement for time since implant; 2. Score ≥5 on the Hospital Anxiety and Depression Scale (HADS) anxiety or depression scales; 3. Able to read and write English 4. Able to commit to the 3-month QOLT/HHE program and 3 assessments over a 9-month duration. Exclusion Criteria: 1. \>5% atrial or ventricular pacing; 2. Sinus node dysfunction; 3. Persistent and permanent atrial fibrillation (AF) (h/o of paroxysmal AF will be allowed). 4. Long QT syndrome; and other channelopathies such as Brugada syndrome; 5. Hypertrophic cardiomyopathy; 6. Neurocognitive or cognitive impairments; 7. Severe psychopathology that warrants intensive treatment; 8. Participation in another research trial; and 9. Currently in psychological or psychiatric treatment. 10. Current psychotropic and cardiac medication prescriptions and usage need to be stable (i.e., no change in type or dosage) for 3-months prior to study enrollment.